JPS59172914A - Connecting tube for wavy wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to connecting parts such as connectors for connecting corrugated electrical conduits made of synthetic resin (plastic) to boxes, or couplings used to connect electrical conduits to each other. The main objective is to provide a one-touch connecting tube that can accomplish a predetermined connection simply by inserting the conduit.

Plastic corrugated conduit pipes are lighter and more flexible than traditional metal pipes or hard PVC pipes (straight pipes), and can be installed in long lengths, making them easier to work with. It has great practical benefits as a conduit for electrical equipment wiring in buildings, factories, etc.

However, corrugated conduit that can be installed in long lengths also requires connection to a box or intermediate connection in the middle of piping, just like conventional conduit, and special connecting parts must be prepared for this purpose.

By the way, conventional connecting parts for conduits of this kind generally include adhesive type parts that connect the conduit pipes by applying an adhesive, and screw type parts that connect the conduit pipes by screwing. However, in the case of the former adhesive type, it is necessary to prepare the adhesive and carefully apply the adhesive with a brush, while in the case of the latter screw type, it is necessary to tighten the screws one by one with a screwdriver. These items require the preparation of extra materials and tools, and the work is time consuming and requires a large number of man-hours, which poses problems in terms of workability at the piping site.

The present invention has been made in view of the above-mentioned circumstances, and allows the operation of simply inserting the conduits without requiring any extra work when connecting corrugated conduits to each other or connecting the conduits to boxes. It is an object of the present invention to provide a connecting pipe of this type that can achieve a predetermined connection.

That is, the gist of the present invention is that, in the socket part of the connecting pipe main body, which has a socket part into which the end of the corrugated electric conduit is inserted and received, the inner surface thereof is capable of fitting into the outer circumferential corrugated part of the corrugated electric conduit. A pipe surrounding portion having a locking protrusion and a plurality of cracks on the circumferential surface is provided, and each of the split body portions is divided between the split body portions formed by the plurality of cracks in the pipe surrounding portion. A connecting pipe for a corrugated conduit is characterized in that the connecting pipe is bridged via a deformable part so as to be expandable and displaceable.

The tube enclosing portion can be constructed as a separate body at the socket portion of the connecting tube main body. However, it is also possible to form it integrally with the socket itself.

If it is separate, it can be provided by a split ring. That is, the rings form a tube surrounding inner circumferential surface when combined, and a locking protrusion that can fit into the outer circumferential corrugated portion of the corrugated electric conduit is formed on the inner circumferential surface.

The ring is constructed by enclosing and fitting into the outer layer of the socket portion of the connecting pipe, and bridging the divided body parts of the ring via an elastically deformable member.

On the other hand, in the case of one piece, it can be obtained by processing the socket itself.

In other words, a plurality of predetermined cuts are made in the axial direction on the circumferential surface of the socket part to form a crack, and the outer circumferential corrugated part of the corrugated conduit can be fitted to the inner surface of the divided body formed by the crack. It is possible to form a locking protrusion, and to make each of the divided body parts capable of expanding and displacing by its own elastic deformation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to the drawings.

FIG. 1 shows an example of a main body of a coupling for a corrugated conduit. A connecting tube body 1, which forms the main body of the coupling, has sockets 4, 4 on both sides in the axial direction into which the ends of corrugated electric conduit tubes 2 are inserted and received, as shown in FIG. The socket portion 4 has a tapered inner circumferential surface 4' whose diameter gradually decreases in the axial direction of the tube from the tube end, so that it can accommodate variations in the outer diameter of the electric conduit 2.

FIGS. 3 and 4 show an embodiment of the present invention applied to a connecting pipe coupling in which a pipe surrounding portion 5 is provided in the socket portion 4 of the connecting pipe main body 1. FIG. The tube enclosure 5 is provided by a two-part molded ring 6.

That is, the ring 6 has two half-split body parts 6A.

6A, and by this combination, approximately one half in the axial direction fits around the outer periphery of the tip of the socket part 4, and the other half extends in front of the tip of the socket part 4, thereby setting the pipe surrounding part 5. do. Between the mutually fitting surfaces of the ring 6 and the socket part 4, there is provided a radially protruding part on the outer periphery of the tip of the socket part 4. The grooves 6a are recessed in the radial direction, and the grooves and grooves are fitted into each other.
As a result, the ring 6 is locked in the axial direction of the tube, but is supported so as to be able to expand and move in the radial direction of the tube. On the other hand, the tube surrounding part 5
In combination, a triangular prism-shaped locking protrusion 8.8 has a tube insertion hole 7 with an inner diameter that matches the outer diameter of the corrugated plus deck conduit 2, and is inclined at least toward the tube insertion direction on the inner surface of the hole wall. It is integrally formed with a protrusion.

After the ring 6 is fitted into the socket 4 in a concave-convex manner, a screw 10 is inserted between the split parts 9 and 9 of the divided body parts 6A and 6A.
．． 10 and screw the nut 11.11 to bridge the tightening, but at this time, the elastic deformable member 12.12 such as a spring is used.
Tightening is assembled through. By tightening the screws 10.10 while leaving the amount of elastic deformation of the elastic deformation member 12.12, the divided body parts 6A, 6A are always elastically tightened and assembled together after assembly. On the other hand, the valve split body portions 6A, 6A can be opened apart from each other while compressing the elastic deformation members 12, 12.

Looking at the connection operation of the connecting pipe of this embodiment configured in this way, first, when the end of the corrugated electric conduit 2 is pushed into the insertion hole 7 of the ring 6, the locking protrusion 8 is inserted at the end of the pipe 2. ．．
Push the front inclined parts 8a, 8a of 8, and use that force to push the ring 6
The divided body portions 6A, 6A are expanded apart from each other, so that the electric conduit 2 can be inserted to the position of the tapered inner circumferential surface 4- of the connecting tube socket portion 4. At the time of such insertion, the locking protrusion 8
8 slides on the outer circumferential surface of the conduit 2, but when it corresponds to the appropriate corrugated groove 3, the elastic deformation member 12.12 is elastically compressed by the expansion of the ring. The locking protrusion 8.8 is forcibly fitted into the corrugated portion 3, thereby maintaining the engagement to prevent the pipe 2 from being pulled out.
A predetermined connection of the connecting pipe 1 and the connecting pipe 1 is established.

In this embodiment, the tube surrounding portion 5, which is set to lock the tube 2 to the connecting tube 1 in the axial direction, is constituted by a split ring,
Then, by loosening the tightening screw that bridges the split surfaces of the ring with the tightening screw via the elastic deformation member, it is possible to easily expand the ring and remove it from the conduit. In addition, after the conduit is inserted and connected as specified,
It is also possible to further tighten the tightening screw to increase the elastic force in order to further ensure that the two protrusions fit into the pipe outer circumferential corrugated portion.

5 and 6 show a second embodiment of the connecting pipe of the present invention in which a pipe surrounding part 50 is provided at the socket part 40 of the connecting pipe main body 10. 1° The pipe surrounding part 50 is the socket part/IO tip The split body portions 60A, 6 are formed by forming a plurality of cracks 90.90 by cutting along the tube axis direction from the tube end, and are divided by the cracks 90.90.
It has a structure in which locking protrusions 80 and 80 are integrally formed on the inner circumferential surface of 0A.

Here, the connecting pipe 10 is made of hard vinyl chloride or the like, and has a structure that can exert an elastic reaction force against a slight deformation stress, and each of the divided body parts 60A, 60A has a crack 90 in itself.
．． 90. It is said that it can be elastically expanded and deformed.

According to the connecting pipe of this embodiment, by pushing and inserting the end of the conduit 2 into the socket 40 from the pipe end, the locking protrusions 80 and 80 are inserted at the pipe 2 end as in the first embodiment. Press,
As a result, a component force in the radial direction is generated, and the divided body portions 60A, 6
Each of the 0A is expanded and deformed, so that the electric conduit 2 can be inserted to a predetermined position in the socket 40. When inserted to a predetermined position, the locking protrusion 80.80 that has slid on the corrugated portion of the tube 2 is forcibly fitted into the corrugated groove 3 by the elastic force generated by the deformation of the divided body portions 60A, 60A, and the electric wire is The connecting pipe 10 is connected to the pipe.

In the case of this embodiment, since the tube surrounding portion for locking the shaft of the tube is integrally formed with the connecting tube itself, there is an advantage that the number of parts can be reduced to a minimum of one.

In the above embodiment, the locking protrusion 8 (80) preferably has the following triangular prism shape in relation to tube insertion.

That is, as shown in FIG. 7, the front inclined portion 8a facing the tube insertion side has an angle α of 120° to 1 with respect to the tube insertion direction
By setting the angle in the range of 35°, the sliding property against the outer circumferential corrugated portion of the tube 2 can be made appropriate.On the other hand, the surface portion 8b that locks into the corrugated portion groove 3 of the tube 2 in the tube withdrawal direction When the angle with respect to the direction (withdrawal direction) X is about 80 to 120 degrees, a predetermined axial locking can be achieved.

In the embodiment described above, an example of a coupling for interconnecting electric conduit tubes has been shown, but according to the present invention, one end in the axial direction has an externally threaded portion for connection with a box, and the other end has an external threaded portion for connecting the electric conduit tubes. By setting the above-mentioned tube surrounding part 5 (50) in the socket part of a connector having a socket part, the present invention can be applied to a connector as well as a coupling.

According to the connecting pipe of the present invention as described above, when used for a corrugated electric conduit, a predetermined connection can be achieved by snappingly engaging the outer circumferential corrugated portion of the limb tube with a one-touch operation of simply pushing the electric conduit, Compared to conventional adhesive application types, screw fastening types, etc., extra materials and tools are not required, and connection work can be completed in just one hour.
The effect of contributing to improving economic efficiency is enormous.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of the connecting pipe main body with a part cut out;
The figure is an explanatory diagram with a partial cutout showing an example of a corrugated conduit made of synthetic resin applied to the present invention, and FIG. 3 is an explanatory diagram with a partial cutout showing an example of the connecting pipe of the present invention , FIG. 4 is an explanatory view of the front end of the same figure, FIG. 5 is an explanatory view of the main part showing a second embodiment of the connecting pipe of the present invention with a partial cutout, and FIG. 6 is an explanatory view of the front end of the same figure, FIG. 7 is an enlarged partial sectional view showing in detail an example of the locking protrusion of the connecting pipe of the present invention. 1: Connection pipe body, 2: Corrugated conduit, 4. ．． 40: Socket part, 5, 50: Pipe surrounding part, 6: Ring, 6A. 60A=divided body part, 8.80: locking protrusion, 9°90: crack, 12: elastic deformation member. 11- Figure 1 Figure Z

Claims (1)

[Scope of Claims] 1. In the socket part of the connecting pipe main body, which has a socket part into which the end of the corrugated electric conduit is inserted and received, the inner surface thereof is capable of fitting into the outer circumferential corrugated part of the corrugated electric conduit. A tube surrounding part is provided which has a locking protrusion and a plurality of cracks on the circumferential surface, and each of the divided body parts expands between the divided body parts formed by the plurality of cracks in the surrounding part. A connecting pipe for a corrugated conduit, characterized in that it is bridged via an elastically deformable part so as to be displaceable. 2. The front pipe enclosing part is formed by a two-split ring, and the ring is fitted around the outer layer of the socket part of the connecting pipe main body, and each split body part of the ring is bridged via an elastic deformable member. A connecting pipe for a corrugated electric conduit according to claim 1. 3. A patent in which the pipe surrounding part is configured by forming a plurality of cracks on the circumferential surface of the socket part itself, and the divided body parts formed by the plurality of cracks can be expanded and displaced by their own elastic deformation. A connecting pipe for a corrugated electric conduit according to claim 1.